html,
body {
  height: 100%;
}
ul,
ol {
  list-style: none;
  margin: 0;
  padding: 0;
}
.lt-layout {
  position: relative;
  width: 100%;
  height: 100%;
  max-width: 640px;
  min-width: 320px;
  background-color: #fff;
  margin: 0 auto;
  padding: 45px 0 50px 0;
}

.lt-header {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 45px;
  background-color: #069;
  padding: 0 45px;
  h4 {
    text-align: center;
    line-height: 45px;
    margin: 0;
    color: #fff;
    font-weight: normal;
    font-size: 20px;
  }
  a {
    position: absolute;
    left: 0;
    top: 0;
    width: 45px;
    height: 45px;
    color: #fff;
    text-align: center;
    line-height: 45px;
    font-weight: 700;
  }
  .search {
    left: auto; //清除统一定义的left值
    right: 0;
  }
}

.lt-main {
  position: relative;
  width: 100%;
  height: 100%;
}

.lt-footer {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 50px;
  background-color: #069;
  ul {
    li {
      padding-top: 5px;
      float: left;
      width: 25%;
      text-align: center;
      a {
        color: #fff;
        span {
          display: block;
        }
        span:nth-child(2) {
          font-size: 14px;
        }
      }
    }
    .current {
      a {
        display: block;
        color: orange;
      }
    }
  }
}
